Deduplicate Words in a String

Easy

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Problem

Given a string s containing words separated by single spaces, return a new string with duplicate words removed while keeping only the first occurrence of each word. The relative order of the remaining words must stay the same.

Constraints

1 <= len(s) <= 10^5
s contains only lowercase English letters and single spaces
Words are separated by exactly one space
The output should contain each word at most once

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def solve(rows):
    counts = {}
    for row in rows:
        ...
    return result

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